sealion german invasion england september wargame simulate hypothetical german invasion england late circa september assume german achieve air superiority royal air force game incorporate unabstracted level detail air naval operation facet land operation operational strategic assume british lose eponymous battle britain raf completely fight royal navy present credible threat germansrsquo amphibious landing supply conduit english channel ground german operational superiority british army rely interior line communication defensible terrain include crude network hastily construct fortification build invasioncomponent x inch map diecut countersworld war februarymarch issue

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